北方不同作物对深层黄土母质生土的施肥反应

不同作用对生土的适应能力以及对施肥的反应有极大差异：豆科作物的适应力强，对肥反应敏感性低，不施肥也可完成生育周期获得微薄的经济产量；与豆科作用相似的非豆科作物有葵花、荞麦等，但不施肥不能形成经济产量；甜花等块根茎类作用有施肥情况下中后期生长迅速，根系生物量大，对改良生土有利；禾谷类作物及棉花对施肥反应极为敏感，不施肥则早期死亡或生长极差。

The Reactions of Different Northern Crops to Fertilization on Deep Loess Parent Material Immature Soil

The adaptive ability of different crops to immature soil and reactions to fertilization were obviously different. Legume had strong adaptive ability and low sensitive reaction to fertilization. They could mature and had few economic yield without fertilization. Sunflower and buckwheat were similar to legume but they hadn't economic yield without fertilization. Beetroot and root or stem tuber crops grew quickly during middle late stage on fertilizable condition, meanwhile the root weight were big. It would be useful to improve immature soil. Cereal crop and cotton had obviously sensitive reaction to fertilization. They grew badly or died in early growing period without fertilization.